| 11. | Symptomless trees also represent a greater danger in terms of spread of the viroid.
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| 12. | Viroid RNA does not code for any protein.
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| 13. | It serves as a model system for research on the satellite RNAs and viroids.
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| 14. | It is however thought that RY motifs are essential for establishing a viroid infection.
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| 15. | The viroid enters the cell via its plasmodesmata.
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| 16. | Infected but symptomless trees have a higher concentration of viroid particles than those showing symptoms.
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| 17. | That is because both viroids have 64 % of their sequence of nucleotides in common.
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| 18. | Related to but distinct from the RNA viruses are the viroids and the RNA satellite viruses.
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| 19. | Viroids thus are true circular RNAs.
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| 20. | The amount ( titre ) of viroid particles present in avocado trees varies a great deal.
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